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He becomes Frank de Boer's first signing since becoming the new Eagles boss and will offer competition for places in the centre of the park, particularly to the likes of Jason Puncheon and Jonny Williams.

Palace are still in the market for more new faces, with centre-back a priority. Liverpool's Mama Sakho remains no.1 target but his £30m valuation could be too high for the Eagles. Other defensive options like Ajax trio Joel Veltman, Davinson Sanchez and Jairo Riedewald linked.